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@donaldh
Created June 12, 2012 15:08
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Modified force-multi-foci.html to add a convex hull
<!DOCTYPE html>
<html>
<head>
<title>Force-Directed Layout with Convex Hull</title>
<script src="http://mbostock.github.com/d3/d3.js?2.7.4"></script>
</head>
<body>
<div id="chart"></div>
<script type="text/javascript">
var w = 960,
h = 500,
fill = d3.scale.category10(),
nodes = d3.range(100).map(Object);
var vis = d3.select("#chart").append("svg")
.attr("width", w)
.attr("height", h);
vis.append("path")
.style("fill", "#ccf")
.style("stroke", "#ccf")
.style("stroke-width", 20);
var force = d3.layout.force()
.nodes(nodes)
.links([])
.size([w, h])
.start();
var node = vis.selectAll("circle.node")
.data(nodes)
.enter().append("circle")
.attr("class", "node")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", 8)
.style("fill", function(d, i) { return fill(i & 3); })
.style("stroke", function(d, i) { return d3.rgb(fill(i & 3)).darker(2); })
.style("stroke-width", 1.5)
.call(force.drag);
vis.style("opacity", 1e-6)
.transition()
.duration(1000)
.style("opacity", 1);
force.on("tick", function(e) {
// Push different nodes in different directions for clustering.
var k = 6 * e.alpha;
nodes.forEach(function(o, i) {
o.x += i & 2 ? k : -k;
o.y += i & 1 ? k : -k;
});
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
vis.selectAll("path")
.data([d3.geom.hull(nodes.map(function(d) { return [ d.x, d.y ]; }))])
.attr("d", function(d) { return "M" + d.join("L") + "Z"; });
});
d3.select("body").on("click", function() {
nodes.forEach(function(o, i) {
o.x += (Math.random() - .5) * 40;
o.y += (Math.random() - .5) * 40;
});
force.resume();
});
</script>
</body>
</html>
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